The pattern loom was a real outstanding achievement, and operated beautifully.
The bumpiness of most Meccano looms has been eliminated with the use of an intermittent system to various movements.
The warp threads are lifted by four heald frames whose sequence is determined by a cluster of four cams.
The cam cluster is indexed by a 1/8th turn after each shuttle pass, so that a repeat length of the pattern is a maximum of 8 weft threads.
The pattern is changeable at will by inverting alternative cam clusters which are held in by a spring loaded locking pin.
The lift of the heald frames is accomplished by an intermittently driven rising and falling bar.
A claw which is part of each heald frame leaver arm is positioned by the cam action to either engage with or disengage from the bar.
The shuttle is positively driven by a rack mechanism and is supported in roller guides so that free running and thread clearance is obtained.
The warp pitch is 15½ threads to the inch with a maximum of 70 warp threads giving a material of 4½” width. A very good model and well built.